diff --git a/Assets/PerfectWorld/Scripts/Move/AutoPFImp/AutoMove/CMoveAgent.cs b/Assets/PerfectWorld/Scripts/Move/AutoPFImp/AutoMove/CMoveAgent.cs
index 6d6361f27b..cf25f49124 100644
--- a/Assets/PerfectWorld/Scripts/Move/AutoPFImp/AutoMove/CMoveAgent.cs
+++ b/Assets/PerfectWorld/Scripts/Move/AutoPFImp/AutoMove/CMoveAgent.cs
@@ -178,7 +178,9 @@ namespace AutoMove
             open.Push(m_ptStart, Heuristic(m_ptStart, m_ptGoal));
 
             int expands = 0;
-            int maxExpand = nMaxExpand > 0 ? nMaxExpand : 200000;
+            //ToDo: need use another method to caculate the value of maxExpand
+            //800000 is a magic number, need to be optimized
+            int maxExpand = nMaxExpand > 0 ? nMaxExpand : 800000;
 
             while (open.Count > 0 && expands < maxExpand)
             {